Flashcards

Geology

Maxwell Carey English 20 cards

Based on this dynamic Mohr Circle, with increasing fluid pressure Pf, what will happen

Cards in this deck (20)

1What affects rock quality and strengthJoint Density
2In general, the shear fractures in rocks will occur at an angle θ to σ1Less than 45 degrees
3Based on this dynamic Mohr Circle, with increasing fluid pressure Pf, what will happenrock becomes easier to break
the minimum principle stress could become negative (tensile)
the normal stress decreases
4Three wells 1, 2 and 3 were drilled to three vertically stacked reservoirs A, B, and C. Based on the pressure data of the three wells within the three reservoirs, which reservoir(s) are compartmentalized with a lateral pressure barrier?A and C
5In this picture, there are two sets of joints, 1 and 2, which statement is correct?1 is younger than 2
6Characteristics of overpressure zones includelow density and low sonic velocity
rapid drilling rate
under-compacted shale
7Whereever shale is overpressured, its porosityincreases
8Lithostatic stress gradient is1 psi/ft
9Borehole wall breakouts occursin the minimum horizontal stress direction
10Hydrostatic stress gradient is smaller than lithostatic stress gradient becauserock and water have different density
11What kind of fault was most likely hit by the wells?Normal Fault
12Which well (s) hit the fault ?Wells No. 3, 4, and 5
13Refer to the sand-box experiment, which fault is youngest?6
14What are these faultsthrust faults
15Appalachian Basin is formed byThrusts
16This picture shows which model of crustal rifting ?symmetric "V-shaped" or pure shear
17This figure shows what kind of structure?a fault-bend fold
18This strike-slip fault restraining bend is typically associateda positive flower structure that serves as an oil and gas trap
19This listric normal fault isyounger than t1 but grows through t2, t3, and t4
20This well most likely hita reverse (thrust) fault